ApcBackendTest.php

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<?php
namespace TYPO3\CMS\Core\Tests\Unit\Cache\Backend;

use TYPO3\CMS\Core\Cache\Backend\ApcBackend;
class ApcBackendTest extends \TYPO3\CMS\Core\Tests\UnitTestCase {

    public function setUp() {
        // Currently APCu identifies itself both as "apcu" and "apc" (for compatibility) although it doesn't provide the APC-opcache functionality
        if (!extension_loaded('apc') || ini_get('apc.enabled') == 0 || ini_get('apc.enable_cli') == 0) {
            $this->markTestSkipped('APC/APCu extension was not available, or it was disabled for CLI.');
        }
        if (ini_get('apc.slam_defense') == 1) {
            $this->markTestSkipped('This testcase can only be executed with apc.slam_defense = Off');
        }
    }

    public function setThrowsExceptionIfNoFrontEndHasBeenSet() {
        $backend = new ApcBackend('Testing');
        $data = 'Some data';
        $identifier = $this->getUniqueId('MyIdentifier');
        $backend->set($identifier, $data);
    }

    public function itIsPossibleToSetAndCheckExistenceInCache() {
        $backend = $this->setUpBackend();
        $data = 'Some data';
        $identifier = $this->getUniqueId('MyIdentifier');
        $backend->set($identifier, $data);
        $inCache = $backend->has($identifier);
        $this->assertTrue($inCache, 'APC backend failed to set and check entry');
    }

    public function itIsPossibleToSetAndGetEntry() {
        $backend = $this->setUpBackend();
        $data = 'Some data';
        $identifier = $this->getUniqueId('MyIdentifier');
        $backend->set($identifier, $data);
        $fetchedData = $backend->get($identifier);
        $this->assertEquals($data, $fetchedData, 'APC backend failed to set and retrieve data');
    }

    public function itIsPossibleToRemoveEntryFromCache() {
        $backend = $this->setUpBackend();
        $data = 'Some data';
        $identifier = $this->getUniqueId('MyIdentifier');
        $backend->set($identifier, $data);
        $backend->remove($identifier);
        $inCache = $backend->has($identifier);
        $this->assertFalse($inCache, 'Failed to set and remove data from APC backend');
    }

    public function itIsPossibleToOverwriteAnEntryInTheCache() {
        $backend = $this->setUpBackend();
        $data = 'Some data';
        $identifier = $this->getUniqueId('MyIdentifier');
        $backend->set($identifier, $data);
        $otherData = 'some other data';
        $backend->set($identifier, $otherData);
        $fetchedData = $backend->get($identifier);
        $this->assertEquals($otherData, $fetchedData, 'APC backend failed to overwrite and retrieve data');
    }

    public function findIdentifiersByTagFindsSetEntries() {
        $backend = $this->setUpBackend();
        $data = 'Some data';
        $identifier = $this->getUniqueId('MyIdentifier');
        $backend->set($identifier, $data, array('UnitTestTag%tag1', 'UnitTestTag%tag2'));
        $retrieved = $backend->findIdentifiersByTag('UnitTestTag%tag1');
        $this->assertEquals($identifier, $retrieved[0], 'Could not retrieve expected entry by tag.');
        $retrieved = $backend->findIdentifiersByTag('UnitTestTag%tag2');
        $this->assertEquals($identifier, $retrieved[0], 'Could not retrieve expected entry by tag.');
    }

    public function setRemovesTagsFromPreviousSet() {
        $backend = $this->setUpBackend();
        $data = 'Some data';
        $identifier = $this->getUniqueId('MyIdentifier');
        $backend->set($identifier, $data, array('UnitTestTag%tag1', 'UnitTestTag%tagX'));
        $backend->set($identifier, $data, array('UnitTestTag%tag3'));
        $retrieved = $backend->findIdentifiersByTag('UnitTestTag%tagX');
        $this->assertEquals(array(), $retrieved, 'Found entry which should no longer exist.');
    }

    public function setCacheIsSettingIdentifierPrefixWithCacheIdentifier() {
        $cacheMock = $this->getMock('TYPO3\\CMS\\Core\\Cache\\Frontend\\FrontendInterface', array(), array(), '', FALSE);
        $cacheMock->expects($this->any())->method('getIdentifier')->will($this->returnValue(
            'testidentifier'
        ));

        $backendMock = $this->getMock(
            'TYPO3\\CMS\\Core\\Cache\\Backend\\ApcBackend',
            array('setIdentifierPrefix','getCurrentUserData','getPathSite'),
            array('testcontext')
        );

        $backendMock->expects($this->once())->method('getCurrentUserData')->will(
            $this->returnValue(array('name' => 'testname'))
        );

        $backendMock->expects($this->once())->method('getPathSite')->will(
            $this->returnValue('testpath')
        );

        $expectedIdentifier = 'TYPO3_' . \TYPO3\CMS\Core\Utility\GeneralUtility::shortMD5('testpath' . 'testname' . 'testcontext' . 'testidentifier', 12);
        $backendMock->expects($this->once())->method('setIdentifierPrefix')->with($expectedIdentifier);
        $backendMock->setCache($cacheMock);
    }

    public function hasReturnsFalseIfTheEntryDoesNotExist() {
        $backend = $this->setUpBackend();
        $identifier = $this->getUniqueId('NonExistingIdentifier');
        $inCache = $backend->has($identifier);
        $this->assertFalse($inCache, '"has" did not return FALSE when checking on non existing identifier');
    }

    public function removeReturnsFalseIfTheEntryDoesntExist() {
        $backend = $this->setUpBackend();
        $identifier = $this->getUniqueId('NonExistingIdentifier');
        $inCache = $backend->remove($identifier);
        $this->assertFalse($inCache, '"remove" did not return FALSE when checking on non existing identifier');
    }

    public function flushByTagRemovesCacheEntriesWithSpecifiedTag() {
        if (version_compare(phpversion(), '5.4.0', '<')) {
            $this->markTestSkipped('This test is not reliable with PHP version below 5.4.0');
        }
        $backend = $this->setUpBackend();
        $data = 'some data' . microtime();
        $backend->set('BackendAPCTest1', $data, array('UnitTestTag%test', 'UnitTestTag%boring'));
        $backend->set('BackendAPCTest2', $data, array('UnitTestTag%test', 'UnitTestTag%special'));
        $backend->set('BackendAPCTest3', $data, array('UnitTestTag%test'));
        $backend->flushByTag('UnitTestTag%special');
        $this->assertTrue($backend->has('BackendAPCTest1'), 'BackendAPCTest1');
        $this->assertFalse($backend->has('BackendAPCTest2'), 'BackendAPCTest2');
        $this->assertTrue($backend->has('BackendAPCTest3'), 'BackendAPCTest3');
    }

    public function flushRemovesAllCacheEntries() {
        $backend = $this->setUpBackend();
        $data = 'some data' . microtime();
        $backend->set('BackendAPCTest1', $data);
        $backend->set('BackendAPCTest2', $data);
        $backend->set('BackendAPCTest3', $data);
        $backend->flush();
        $this->assertFalse($backend->has('BackendAPCTest1'), 'BackendAPCTest1');
        $this->assertFalse($backend->has('BackendAPCTest2'), 'BackendAPCTest2');
        $this->assertFalse($backend->has('BackendAPCTest3'), 'BackendAPCTest3');
    }

    public function flushRemovesOnlyOwnEntries() {
        $thisCache = $this->getMock('TYPO3\\CMS\\Core\\Cache\\Frontend\\FrontendInterface', array(), array(), '', FALSE);
        $thisCache->expects($this->any())->method('getIdentifier')->will($this->returnValue('thisCache'));
        $thisBackend = new ApcBackend('Testing');
        $thisBackend->setCache($thisCache);

        $thatCache = $this->getMock('TYPO3\\CMS\\Core\\Cache\\Frontend\\FrontendInterface', array(), array(), '', FALSE);
        $thatCache->expects($this->any())->method('getIdentifier')->will($this->returnValue('thatCache'));
        $thatBackend = new ApcBackend('Testing');
        $thatBackend->setCache($thatCache);
        $thisBackend->set('thisEntry', 'Hello');
        $thatBackend->set('thatEntry', 'World!');
        $thatBackend->flush();
        $this->assertEquals('Hello', $thisBackend->get('thisEntry'));
        $this->assertFalse($thatBackend->has('thatEntry'));
    }

    public function largeDataIsStored() {
        $backend = $this->setUpBackend();
        $data = str_repeat('abcde', 1024 * 1024);
        $identifier = $this->getUniqueId('tooLargeData');
        $backend->set($identifier, $data);
        $this->assertTrue($backend->has($identifier));
        $this->assertEquals($backend->get($identifier), $data);
    }

    public function setTagsOnlyOnceToIdentifier() {
        $identifier = $this->getUniqueId('MyIdentifier');
        $tags = array('UnitTestTag%test', 'UnitTestTag%boring');

        $backend = $this->setUpBackend(TRUE);
        $backend->_call('addIdentifierToTags', $identifier, $tags);
        $this->assertSame(
            $tags,
            $backend->_call('findTagsByIdentifier', $identifier)
        );

        $backend->_call('addIdentifierToTags', $identifier, $tags);
        $this->assertSame(
            $tags,
            $backend->_call('findTagsByIdentifier', $identifier)
        );
    }

    protected function setUpBackend($accessible = FALSE) {
        $cache = $this->getMock('TYPO3\\CMS\\Core\\Cache\\Frontend\\FrontendInterface', array(), array(), '', FALSE);
        if ($accessible) {
            $accessibleClassName = $this->buildAccessibleProxy('\\TYPO3\\CMS\\Core\\Cache\\Backend\\ApcBackend');
            $backend = new $accessibleClassName('Testing');
        } else {
            $backend = new ApcBackend('Testing');
        }
        $backend->setCache($cache);
        return $backend;
    }

}